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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47183e6d1bec553963ce5a7161b6a496b4bdc2aa8a2e7dcbc198876d698608d' 
  AND token = '9JygHpFOClotRZgUNdg9hKVhe8EGvdFwCtSXZhin+oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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