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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c60c61692d38a33c70854459399790165e3a6755e364e7692abe86111e690c' 
  AND token = 'R/CZhZMaPlC+9WE3Br/V7MNThcJJx2g6w1oljAUj7ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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