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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f982fb5a6d024f2abcfca751f64eb3800add0b95f092934d58ded42e05abd88' 
  AND token = 'ue6upQdIehgan93krW2se14TOpTiNGp7biQ2WGGel+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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