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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a437c4f74bb522667061789c9939676a2b5aa5d3149b50c8d3d98393f645b1d' 
  AND token = 'Q5c/eT2IZbowrsJPYhIOU7wRk/89RKkhnciOg9xvikE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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