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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9b7435a760fed7c0a7c897542747ba50af7e8f49e56e0faa3bfe5f9b01e504' 
  AND token = '0y5A8o/bLtFKh9wIU5brpelQMBKMTVzxK1Df2b1Psvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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