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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7e6ef3aeb049624b886d6eabae34b564602d11daa20592bab35fffca9174cb' 
  AND token = 'j5BWZa096mZqv08G6W+9IkbGJCRSXG6Uwekp0nIHJzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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