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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e310cc70347f594eb68e205dadb114c8737c4594fc2c6f3f5dc7c5f97a61caae' 
  AND token = 'VeUGi3QmKFUuDecdigwWOVrpQ9E+2KglzzelR1JyxnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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