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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c24d292557c88d88ecf90e5ff6985220c74b7e067462f9cb79d64eb1b939354' 
  AND token = 'knfZ5P/odq/vOt9/rayT2jTe8qx7cAuA9xxqOUC/BJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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