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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7150b25b1910d1bf0cfa65510813e28bd39678988dc3d912f5a7f59ceb35e8dc' 
  AND token = '7bTig6mbx7naTyZK+OxYgq0Yjohi50NczHqRv4kyiKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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