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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c516847d457f72e51591ae4aaba67b2882540e8936cc7d438b7e7c174d9770ed' 
  AND token = 'tYmpJEJ8aHFz40oeM7WPRXxiL8XaVgTwpOBz28d1n6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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