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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28f7491aae09a74702a1c2424e67e95038cb6759758cfe08a596034697ef5c60' 
  AND token = '3gFbO17V0nWBY12J4CuL9LEefCy4efHuBztI7sxBL1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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