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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c76e9143712be2a0b8018d1355ff18c107011935400ca797a6265aae2dd02109' 
  AND token = 'o2Lmqbh6zo2BPa2XXMlTeOxEF31jcfOZlH0yUMfg41I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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