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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40f42030c243ef0153c1c30a4fb236a8767383b55262a433c58fd85dae5777cb' 
  AND token = 'AEyk7M17SCINJ6haIZi3UL3qaeVr/hUx87Dsm3TDLkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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