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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213711516f503e365403567460d572805565e407c0061fdbf3290196f0ee1b5e' 
  AND token = 'KBGKDfHtq6+VsmHTY6pfkG2UtTHbrgrfyYxr/oZxcsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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