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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936d9d1ac417d1a20e1deb0190c6e56d0b98534cc257381266a5bb0bda96cf9d' 
  AND token = 'dyqcRB9ADftmQO2M7GM95FoXNq1TSlQsjKRF5p1LVwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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