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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a7ae29f2584d0e345653de1b5c004ac07be58cf006fea654fc90e11ec7c8241' 
  AND token = 'USmaEvLLCynCNMRQz2g4LcVnICqDk+KMCHdNtn0cF78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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