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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc27a4ca105684a561ee3379592a5a0dec3cfb9a943472de0a6452d12e0af70' 
  AND token = 'ssFfjXN8NNoiYgVDJhHJGp9ryB03mKHcdmoVbU1ORCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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