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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb98e279dae82ae20d8c9c2f2ea3c23b3e6628154e5dee7576834a6a481265a6' 
  AND token = 'gpySl4Wv0v4LkvKwwH2ozZdwdq7Ki7OxGhcMmnB/24M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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