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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60519ad8776456c8d4770c2a39f140ef0a89bedbfc0f3683c7b6165def1d37e' 
  AND token = 'F0GyroP1edjfrg1rnv6yTNa449GddmKOF7OSkdrWll8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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