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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f082de6fd241bf00ebb3cdda3749ed4cc5f54fb03f3ae92d5b69fb1701c875a' 
  AND token = 'tdja9908K3Yaj7LiRhqHmrFv9gP5mcbIXlQpKDKM/o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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