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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7c2cb974659186851f5fe3b48ff622016de39ca1ad5d90675a90dec7ea4ed2' 
  AND token = 'ZCCj10uC988hdnKrGOw50BIm8tMErXTi8AzX/ZFPNkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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