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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d44863cb0f97db74cbccf90019321a0b71b957ee4585a71dfb8ed2efbb4525' 
  AND token = 'PSDJENyXTZEy6/Zvy0QftLM9w+H4ydJa9LQEthwSlAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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