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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c9814b544d3db7fdf23a672863a72e164b3a498e55b204017829d3a7b2af51' 
  AND token = 'p89Ine+voBsS/AcX1J9vYNBdWmgWS6bBDvynXqmRJOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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