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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8b2daffa9d9a004126b0978939ef3eccb0a24d491b67df62c5ab1a1a4fb8b9' 
  AND token = 'feAk0y2c5GlGSFKAUqIwvAKSG2wZTqKrBJ2N2F4ycWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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