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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b7921ebf77c36e29ff44a4071069b7fdb014bbb1637a6760bbef55103a51ae' 
  AND token = 'gn8b3DXQjgWGn8Mu18KhjzclFuice35TL41WbXYD8AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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