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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1257a7b87a8299df9d63ef9b85dd6533bad29c611481d43ea510a588b2530dc0' 
  AND token = 'us9ZS5VmIwioea5TcuZgUW7Qbg1aYi/H9S7lx1fESPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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