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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067aaf4d1a13f3a7c571ebf5f5c33dbec5a41d6f867ca20024de7405bc9272bb' 
  AND token = 'N3BYk6DgKKFOqU6JS1JiWd7BBsrcreocOpxmG9poy8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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