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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73f1e6fd8f03bfd92e51ef9f3b4ab6f6b460e143cb73768c9671af4ed0ecf6ce' 
  AND token = '1img+d8+zuiU0CQl+XgQzit5m+DAHlWqnG2iQNG9y8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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