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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1390ba37a245bd0bbfdc7b8243c2baac9db083a04583803adeb5cf4b572c27d6' 
  AND token = 'ecgaeCUDUN3q5wfxvpgooow/YdkueUf1ItEabVE6QI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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