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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '482b5401b2b93a8d778a00f07f42f8b65022ed734981b1b1d61ddaea30abdff1' 
  AND token = 'Q6pBFb1pic7bCI90jzrANJJPWAuyE+2x5POLI+bfAew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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