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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dfa28b05824233879ecd8711b8f44849c11f2a81927a12510b85477e84fe58' 
  AND token = '9Yb8SYF69Tx3B2dcwMvZv14TgUuGWa5B9ec3izs/7pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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