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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa420c96f9aa575f3cd9d8322f235f5e066e4835401a643b7126ce3ca2cf7fc3' 
  AND token = 'mLdKHZLrw3t8HmzLYqhUnrgfAk30yTqTViPLapsmS4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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