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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6200361bd991f3092c457110b4f238c04209f21895f6db944140a88d937e187' 
  AND token = 'NnShE5/hWlUZaXllcWG+Tq4Gis87x7rt/KJ8MrJTOU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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