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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f031c8899fabdaa7933e112ae4c542fdfea0b88c7c2542cd7f5da56298e96be2' 
  AND token = 'inkVk4/iTBrd3LU5gwWaV29zdVHPWW4AMeSj53gGZZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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