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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabf5e7617b4c440eaa47ef749bbf5a8c3ff83e01cfa82fb10326e788a893554' 
  AND token = 'Bnv5bDtiE6pD8CHdHaX986xFlJikoH2PVMt1fiYSQfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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