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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd179f037740a252ee6b8f11cef73b071d171901be35faf8e5594742d9907b43' 
  AND token = 'uWrK82QWfOJFvE0eSy9qKCtvHtnilZLJQeFDWi/CxKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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