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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c0d30920079de5a03cdc26c745c673ebc766caa5e0def71381e3100f97fdcf' 
  AND token = 'x+Jw8G4KfTiMXendniZdgUTFrA7LIIq6QwZ3ZM5zXjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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