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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3691699c2211599bac43633a5514423b1d6d212f337adccc3a65c7ad8ba7744f' 
  AND token = '42BqoFBQq84YlnDTV4F6Uuwss7W6kFibw5HaY3QVZq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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