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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411d2568817eef7615250f7cd10b1a41ab5ec86d8c59e08db56bc50388785f51' 
  AND token = '6ndkwGutKZdp29xLZUOBkkqKKKHUPte9mZnO5ZJ4Y+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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