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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc0996be08e70515fa0b640f209c56e6b1063ea2b60b5504fa161e0e068a1a9' 
  AND token = '+SFajcLISY3ZaLOWvO3Ibe+EVxIbOVMV69juGLeacTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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