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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c5d360c349ffb16d08043733597b9cd367d1ba509320a776f035b7d92ac70d' 
  AND token = '8YuoL/c03+VBJ4H4xHLnffHhNsejaGFzJxO7+ulqO5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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