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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e03a6e3b1da28ef4459ed0eb792b115f3177026c6992d916ad30c6245af9368' 
  AND token = 'tgTVAKIGtdA1jnW9nAu+RKB+DE9hP/CQaykLp6AKF9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}