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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f691dc4186cc059c3258dae46359d0c62a0bc94e5b0f7bfb003d5aa4454f41' 
  AND token = '1hrExbv0TUfu7YfZt383WUxRDb9TBN6wqI4fPkbEEmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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