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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7f0804586f7813711a819d0cc47f0d9d17210232d48674dc5024886c845e93' 
  AND token = 'kqBUR+5gxRaQBgLWBnZgeU/7C6/19d05rbxjrnqoDG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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