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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd44f130444f0d11c5064f57c4b7ae09e8469839c48f48d5b7218ae5b817072' 
  AND token = 'vpxWf12W8NP0gAGGXa7DQzPnanMlVa2boQ1omu2PgjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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