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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7997625d71a797bf359f0d1744b717f1eeb00c5522951045a3e6e030303bfa9e' 
  AND token = 'VjF0LsvCex2LrzL7j8Ok9jWlbllf9HjTZkiNa/B/mJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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