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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02e8cc22cced2e8ded5518c42b94e9e06ceafd454acc18226e1d7757e72a4cc' 
  AND token = 'YL6MI3dzype8LnkLWSSRcAtl6Bq2U5Hefw5Pci229bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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