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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b0c0f88b5c1cca4e589b2ca82181907e81a4b06350d018c5a41a95455109f5' 
  AND token = 'JhappF99xBtfjz5EnhJgjyXBeZklLhxDIrKZURKrcpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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