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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6da87522b00e6dd8f0c6bd46243520099fb913b33e0ec48b3851fae537299c1' 
  AND token = 'jN31KvCanERFrW5cEoQIO3daTgq9u8o9TbJokCjBKOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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