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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd40d8505a3466da89e0c73ea071a86f34d435e1b6406a24b9d0644ad6d9425f3' 
  AND token = 'f4cBCcIQNWRNwX/ssynh6G94LKcQw+YGOVS/jqMjdns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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