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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff80adec7e761c2a9da2e521788a481951e4f1f55bbe782ca6951b2ba6271652' 
  AND token = '5mWqcu+/xqFYNXi1Y+a5HJ2xZO0v4OyrQMQXlpm6fk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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