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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7caa03ff0dbb6e175d64aec2b92ce315b7a83727a0562f6df9e23c42d59a5f43' 
  AND token = 'p90DVlYcoktO3r43HZm3u0JssMK8VMIZ1irvm8oqM+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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