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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df6a56e602a2ee0bbb3ea1a60dc69ca342510aaf734dae141e368b125ee8c98' 
  AND token = 'Uh7plc6ZgTDcTWV7A6wmp5jtZGpWMpNebhyZm9zwYyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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