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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9a227eac55a0f98474edd9d17b219067efa7ceb6fffb274820a0524be0976b' 
  AND token = 'rz19rgeoH4kSDtZgaIYIvlbdsi1q5Y4604a9weldeaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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