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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00966f01f8d3095b81300cc0f58f4bdc28bbc439a8d0ba03644d6831bc681caa' 
  AND token = 'syMtworHeo84mAI81MZ2RNGGQ3ezAgr1IPiP4Gtvbto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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