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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef902156a724c5a52619416ea58a2057d0382c3fbeb8d1b0f9d26233350d2bb9' 
  AND token = 'Fdnrr8dBjcEMP2tnvMQn+2Z2srsqwFjRWNnT5OBtzZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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