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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5a04d2da4df8d069f527989b5b6c3c1d8e36519c7bf0370ca8055b251fb9845' 
  AND token = 'epZCxVepLKANO183NGqp+61JoQyLEJUxGBrGIm4Yn0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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