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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806cd4b3c118bdbab765f289997d4d4a89f663a38831a9c26ba3804f3b6c0b25' 
  AND token = 'mzDqUtH96Rq3uDfsxObQ+roUzzXYV9BmQz+IPQRx6B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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