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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed4d064bfdd998b11e7fb25d4726f982afff021d0d849f76e3b5819b76ce7a15' 
  AND token = '0Oae3bwusk4ZqXAMTc/2YuqOfNT8AtWKB+y8XOWJztY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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