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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d455c2109f2448ca30a38284ed5769ef64498257aca6bd948da8f6d5a5672a' 
  AND token = 'xdBRn1LFxI490m2Ucjfl+VNp/2jQeG6Vt1bUFwb1ta4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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