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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75942ca99e394f2473f254b15c1186dc761818f88b2aca66e33765bbce09771' 
  AND token = 'WA16gxddG9Dhifr+iYi1LwyWuPqAW5mMv+TX1FRLAmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00376

JSON explain

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