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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7909efd84541f1fa9e61eaedb09c1008f452cc77394dbd5b5039fa42df3c981f' 
  AND token = 'gjGqHOQKbScQ9RerkjX1+9JpwRKxaY9994pgumZC7D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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