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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8845a9312a5094b03e8b6ce65a61e99849782e90ea98e84e1e6951d27402c709' 
  AND token = 'sl6FaIlqY1XuDEUoTKCeNp7pME8W4TQamuwwuh1U9zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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